Designing Au Surface-Modified Nanoporous-Single-Crystalline SrTiO3 to Optimize Diffusion of Surface Plasmon Resonance-Induce Photoelectron toward Enhanced Visible-Light Photoactivity

作者：Lu, Da; Ouyang, Shuxin^*; Xu, Hua; Li, Dewang; Zhang, Xueliang; Li, Yunxiang; Ye, Jinhua^*

来源：ACS Applied Materials & Interfaces, 2016, 8(14): 9506-9513.

DOI：10.1021/acsami.6b00889

• plasmonic photocatalysis
• Au
• SrTiO3
• nanoporous single-crystalline material
• isopropyl alcohol photodegradation

Nanoporous single-crystalline SrTiO3 is fabricated at a low temperature of 60 degrees C via a novel approach of sol-gel alkali-dissolution-exothermal reaction. The plasmon-active metal Au is loaded on the nanoporous single-crystalline SrTiO3 material to construct a new kind of plasmonic photocatalyst. Due to the single-crystalline nature and the space confinement effect of pores for Au growing, not only the promoted diffusion efficiency of surface plasmon resonance (SPR)-induce photoelectron is achieved, but also the diffusion region are well optimized via changing the loading amount of Au. Therefore, an optimal sample with 4.8 wt % Au loading exhibits a more than 40-fold photoactivity enhancement under visible-light irradiation compared to the common nanosized SrTiO3 (a commercially available sample) loaded with 5.3 wt % Au which was prepared under the same condition. Furthermore, combining the special nanostructure of Au surface modified nanoporous-single-crystalline SrTiO3 with photocatalytic properties, estimation of the diffusion mean free path of SPR-induce photoelectron can be achieved. This study proposes an alternative approach to enhance the photoactivity of plasmonic photocatalyst via fine designing the semiconductor substrate.

• 出版日期2016-4-13
• 单位天津大学